Fear and its implications for stock markets I. Simonsen, P. T.H. Ahlgren, M. H. Jensen, R. Donangelo and K. Sneppen Eur. Phys. J. B, 57 2 (2007) 153-158 Published online: 11 May 2007 DOI: 10.1140/epjb/e2007-00125-4